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Journal of Applied Physics / Volume 109 / Issue 7 / PROCEEDINGS OF THE 55TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Magneto-Optic, Magnetoelastic, and Magnetocaloric Materials

J. Appl. Phys. 109, 07A936 (2011); http://dx.doi.org/10.1063/1.3562254 (3 pages)

Magnetic entropy changes in nanogranular Fe:Ni61Cu39

S. Michalski, R. Skomski, T. Mukherjee, X.-Zh. Li, Ch. Binek, and D. J. Sellmyer

Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA

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(Received 24 September 2010; accepted 29 December 2010; published online 5 April 2011)

Artificial environment-friendly Gd-free magnetic nanostructures for magnetic cooling are investigated by temperature-dependent magnetic measurements. We consider two-phase nanocomposites where nanoclusters (Fe) are embedded in a Ni61Cu39 matrix. Several composite films are produced by cluster deposition. The average Fe cluster size depends on the deposition conditions and can be tuned by varying the deposition conditions. The quasiequilibrium Curie temperature of the Fe particles is high, but slightly lower than that of bulk Fe due to finite-size effects. Our experiments have focused on ensembles of 7.7 nm Fe clusters in a matrix with a composition close to Ni61Cu39, which has a TC of 180 K. The materials are magnetically soft, with coercivities of order 16 Oe even at relatively low temperature of 100 K. The entropy changes are modest, −ΔS = 0.05 J/kg K in a field change of 1 T and 0.30 J/kg K in a field change of 7 T at a temperature of 180 K, which should improve if the cluster size is reduced.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL METHODS
  3. RESULTS AND DISCUSSION
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

coercive force, copper alloys, Curie temperature, iron alloys, magnetic thin films, nanocomposites, nanomagnetics, nickel alloys, soft magnetic materials

PACS

  • 75.75.-c

    Magnetic properties of nanostructures

  • 75.50.Tt

    Fine-particle systems; nanocrystalline materials

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3562254

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    T. Mukherjee, S. Sahoo, R. Skomski, D. J. Sellmyer, and Ch. Binek, Phys. Rev. B 79, 144406 (2009).

    R. Skomski, Ch. Binek, T. Mukherjee, S. Sahoo, and D. J. Sellmyer, J. Appl. Phys. 103, 07B329(2008)JAPIAU00010300000707B329000001.

    R. Skomski, Ch. Binek, S. Michalski, T. Mukherjee, A. Enders, and D. J. Sellmyer, J. Appl. Phys. 107, 09A922(2010)JAPIAU00010700000909A922000001.

    R. Skomski and D. J. Sellmyer, J. Appl. Phys. 87, 4756 (2000)JAPIAU000087000009004756000001.


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